1
|
Naas S, Krüger R, Knaup KX, Naas J, Grampp S, Schiffer M, Wiesener M, Schödel J. Hypoxia controls expression of kidney-pathogenic MUC1 variants. Life Sci Alliance 2023; 6:e202302078. [PMID: 37316299 PMCID: PMC10267510 DOI: 10.26508/lsa.202302078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 05/31/2023] [Accepted: 06/01/2023] [Indexed: 06/16/2023] Open
Abstract
The interplay between genetic and environmental factors influences the course of chronic kidney disease (CKD). In this context, genetic alterations in the kidney disease gene MUC1 (Mucin1) predispose to the development of CKD. These variations comprise the polymorphism rs4072037, which alters splicing of MUC1 mRNA, the length of a region with variable number of tandem repeats (VNTR), and rare autosomal-dominant inherited dominant-negative mutations in or 5' to the VNTR that causes autosomal dominant tubulointerstitial kidney disease (ADTKD-MUC1). As hypoxia plays a pivotal role in states of acute and chronic kidney injury, we explored the effects of hypoxia-inducible transcription factors (HIF) on the expression of MUC1 and its pathogenic variants in isolated primary human renal tubular cells. We defined a HIF-binding DNA regulatory element in the promoter-proximal region of MUC1 from which hypoxia or treatment with HIF stabilizers, which were recently approved for an anti-anemic therapy in CKD patients, increased levels of wild-type MUC1 and the disease-associated variants. Thus, application of these compounds might exert unfavorable effects in patients carrying MUC1 risk variants.
Collapse
Affiliation(s)
- Stephanie Naas
- Department of Nephrology and Hypertension, Uniklinikum Erlangen und Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - René Krüger
- Department of Nephrology and Hypertension, Uniklinikum Erlangen und Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Karl Xaver Knaup
- Department of Nephrology and Hypertension, Uniklinikum Erlangen und Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Julia Naas
- Center for Integrative Bioinformatics Vienna (CIBIV), Max Perutz Labs, University of Vienna and Medical University of Vienna, Wien, Austria
| | - Steffen Grampp
- Department of Nephrology and Hypertension, Uniklinikum Erlangen und Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Mario Schiffer
- Department of Nephrology and Hypertension, Uniklinikum Erlangen und Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Michael Wiesener
- Department of Nephrology and Hypertension, Uniklinikum Erlangen und Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| | - Johannes Schödel
- Department of Nephrology and Hypertension, Uniklinikum Erlangen und Friedrich-Alexander-Universität Erlangen-Nürnberg, Erlangen, Germany
| |
Collapse
|
2
|
Meng X, Grötsch B, Luo Y, Knaup KX, Wiesener MS, Chen XX, Jantsch J, Fillatreau S, Schett G, Bozec A. Hypoxia-inducible factor-1α is a critical transcription factor for IL-10-producing B cells in autoimmune disease. Nat Commun 2018; 9:251. [PMID: 29343683 PMCID: PMC5772476 DOI: 10.1038/s41467-017-02683-x] [Citation(s) in RCA: 162] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 12/19/2017] [Indexed: 12/18/2022] Open
Abstract
Hypoxia-inducible factors (HIFs) are key elements for controlling immune cell metabolism and functions. While HIFs are known to be involved in T cells and macrophages activation, their functions in B lymphocytes are poorly defined. Here, we show that hypoxia-inducible factor-1α (HIF-1α) contributes to IL-10 production by B cells. HIF-1α regulates IL-10 expression, and HIF-1α-dependent glycolysis facilitates CD1dhiCD5+ B cells expansion. Mice with B cell-specific deletion of Hif1a have reduced number of IL-10-producing B cells, which result in exacerbated collagen-induced arthritis and experimental autoimmune encephalomyelitis. Wild-type CD1dhiCD5+ B cells, but not Hif1a-deficient CD1dhiCD5+ B cells, protect recipient mice from autoimmune disease, while the protective function of Hif1a-deficient CD1dhiCD5+ B cells is restored when their defective IL-10 expression is genetically corrected. Taken together, this study demonstrates the key function of the hypoxia-associated transcription factor HIF-1α in driving IL-10 expression in CD1dhiCD5+ B cells, and in controlling their protective activity in autoimmune disease. B cells are important for antigen presentation and antibody production in humoral immunity, but are also increasingly recognized for their immune regulatory functions. Here the authors show that HIF-1α, a hypoxia-induced transcription factor, is important for controlling IL-10 induction in and immune-suppressive activity of B cells.
Collapse
Affiliation(s)
- Xianyi Meng
- Department of Internal Medicine 3, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, 91054, Erlangen, Germany
| | - Bettina Grötsch
- Department of Internal Medicine 3, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, 91054, Erlangen, Germany
| | - Yubin Luo
- Department of Internal Medicine 3, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, 91054, Erlangen, Germany
| | - Karl Xaver Knaup
- Department of Internal Medicine 4, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, 91054, Erlangen, Germany
| | - Michael Sean Wiesener
- Department of Internal Medicine 4, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, 91054, Erlangen, Germany
| | - Xiao-Xiang Chen
- Department of Rheumatology, Renji Hospital Affiliated to Shanghai Jiao Tong University School of Medicine, 20001, Shanghai, China
| | - Jonathan Jantsch
- Institute of Clinical Microbiology and Hygiena, University Hospital of Regensburg, University of Regensburg, 93053, Regensburg, Germany
| | - Simon Fillatreau
- Institut Necker-Enfants Malades (INEM), INSERM U1151-CNRS UMR 8253, Université Paris Descartes, Sorbonne Paris Cité, Bâtiment Leriche, 75993, Paris, France
| | - Georg Schett
- Department of Internal Medicine 3, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, 91054, Erlangen, Germany
| | - Aline Bozec
- Department of Internal Medicine 3, Friedrich-Alexander-University Erlangen-Nürnberg (FAU) and Universitätsklinikum Erlangen, 91054, Erlangen, Germany.
| |
Collapse
|
3
|
Knaup KX, Monti J, Hackenbeck T, Jobst-Schwan T, Klanke B, Schietke RE, Wacker I, Behrens J, Amann K, Eckardt KU, Warnecke C, Wiesener MS. Hypoxia regulates the sperm associated antigen 4 (SPAG4) via HIF, which is expressed in renal clear cell carcinoma and promotes migration and invasion in vitro. Mol Carcinog 2013; 53:970-8. [PMID: 23818324 DOI: 10.1002/mc.22065] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2013] [Revised: 05/21/2013] [Accepted: 05/31/2013] [Indexed: 12/20/2022]
Abstract
Hypoxia leads to the upregulation of a variety of genes mediated largely via the hypoxia inducible transcription factor (HIF). Prominent HIF-regulated target genes such as the vascular endothelial growth factor (VEGF), the glucose transporter 1 (Glut-1), or erythropoietin (EPO) help to assure survival of cells and organisms in a low oxygenated environment. Here, we are the first to report the hypoxic regulation of the sperm associated antigen 4 (SPAG4). SPAG4 is a member of the cancer testis (CT) gene family and to date little is known about its physiological function or its involvement in tumor biology. A number of CT family candidate genes are therefore currently being investigated as potential cancer markers, due to their predominant testicular expression pattern. We analyzed RNA and protein expression by RNAse protection assay, immunofluorescent as well as immunohistological stainings. To evaluate the influence of SPAG4 on migration and invasion capabilities, siRNA knockdown as well as transient overexpression was performed prior to scratch or invasion assay analysis. The hypoxic regulation of SPAG4 is clearly mediated in a HIF-1 and VHL dependent manner. We furthermore show upregulation of SPAG4 expression in human renal clear cell carcinoma (RCC) and co-localization within the nucleolus in physiological human testis tissue. SPAG4 knockdown reduces the invasion capability of RCC cells in vitro and overexpression leads to enhancement of tumor cell migration. Together, SPAG4 could possibly play a role in the invasion capability and growth of renal tumors and could represent an interesting target for clinical intervention.
Collapse
Affiliation(s)
- Karl Xaver Knaup
- Department of Nephrology and Hypertension, University of Erlangen-Nuremberg, Erlangen, Germany; Nikolaus Fiebiger Center, University of Erlangen-Nuremberg, Erlangen, Germany
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
4
|
Hackenbeck T, Knaup KX, Schietke R, Schödel J, Willam C, Wu X, Warnecke C, Eckardt KU, Wiesener MS. HIF-1 or HIF-2 induction is sufficient to achieve cell cycle arrest in NIH3T3 mouse fibroblasts independent from hypoxia. Cell Cycle 2009; 8:1386-95. [PMID: 19342889 DOI: 10.4161/cc.8.9.8306] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Hypoxia is a severe stress which induces physiological and molecular adaptations, where the latter is dominated by the Hypoxia-inducible transcription Factor (HIF). A well described response on cellular level upon exposure to hypoxia is a reversible cell cycle arrest, which probably renders the cells more resistant to the difficult environment. The individual roles of hypoxia itself and of the isoforms HIF-1alpha and HIF-2alpha in cell cycle regulation are poorly understood and discussed controversially. In order to characterize the isolated effect of both HIFalpha isoforms on the cell cycle we generated tetracycline inducible, HIF-1alpha and -2alpha expressing NIH3T3 cells. The cDNAs for HIFalpha were mutated to generate stable and active HIF under normoxia. Upon activation of both HIFalpha subunits, the total number of living cells was reduced and long-term stimulation of HIF led to complete loss of transgene expression, implicating a strong negative selection pressure. Equally, colony forming activity was reduced by activation of both HIFalpha subunits. Cell cycle analyses showed that HIF activation resulted in a prominent cell cycle arrest in G(1)-phase, similarly to the hypoxic effect. Both, HIF-1alpha and HIF-2alpha were able to induce the expression of the cyclin-dependent kinase inhibitor p27 on reporter gene and protein level. Our study shows that HIF-1 and HIF-2 can individually arrest the cell cycle independent from hypoxia. These findings have implications for the resistance of tumor cells to the environment and treatment, but also for physiological cells. Importantly, recent approaches to stabilize HIFalpha in normoxia could have deleterious effects on proliferating tissues.
Collapse
Affiliation(s)
- Thomas Hackenbeck
- Interdisciplinary Centre for Clinical Research (IZKF), University of Erlangen-Nuremberg, Erlangen, Germany
| | | | | | | | | | | | | | | | | |
Collapse
|
5
|
Heyne K, Mannebach S, Wuertz E, Knaup KX, Mahyar-Roemer M, Roemer K. Identification of a putative p53 binding sequence within the human mitochondrial genome. FEBS Lett 2004; 578:198-202. [PMID: 15581641 DOI: 10.1016/j.febslet.2004.10.099] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2004] [Accepted: 10/31/2004] [Indexed: 11/27/2022]
Abstract
A small fraction of the total cellular amount of nuclear transcription factor p53 seems to be located at and within mitochondria. Transcription factors of the steroid receptor superfamily that, like p53, lack a classical mitochondrial leader sequence are nonetheless imported into mitochondria where they regulate mtDNA transcription through binding to specific recognition sequences. Here, we examined seven candidate sequences from the human mitochondrial genome with similarity to the consensus p53 binding motif. Two imperfect half-sites at coordinate 1553 with homology to the nuclear IGF-BP3 box A binding sequence are demonstrated to confer responsivity to p53 and the p53 relatives p73alpha and beta in the context of the cell nucleus. Mitochondrial p53 may thus bind directly to mtDNA and, perhaps, be involved in the regulation of mitochondrial transcription/replication.
Collapse
Affiliation(s)
- K Heyne
- Department of Virology, Bldg. 47, University of Saarland Medical School, 66421 Homburg/Saar, Germany
| | | | | | | | | | | |
Collapse
|
6
|
Knaup KX, Roemer K. Cell type-specific regulation of calmodulin 2 expression by mutant p53. FEBS Lett 2004; 569:70-4. [PMID: 15225611 DOI: 10.1016/j.febslet.2004.05.052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2004] [Revised: 05/17/2004] [Accepted: 05/18/2004] [Indexed: 10/26/2022]
Abstract
To identify genes that are stimulated by oncogenic forms of mutant p53, we studied, by microarray analysis and PCR-select subtractive hybridization, gene expression changes in human wild-type (wt) p53-negative immortal 041 fibroblasts infected to stably express p53 mutant 175H. In contrast to the wt p53 transactivator, 175H induced only few and weak, gene expression changes. We report here the stimulation of calmodulin 2 (CaM 2), but not CaM 1 or 3, gene expression specifically in 041 cells. The stimulation of the CaM 2 promoter required the 5' untranslated sequences as well as the integrity of the transactivation domain of 175H. However, direct binding of 175H to the 5'UT in vitro could not be demonstrated.
Collapse
Affiliation(s)
- K X Knaup
- Department of Virology, University of Saarland Medical School, Bldg. 47, 66421 Homburg/Saar, Germany.
| | | |
Collapse
|